package me.weijing.common;

import java.util.List;
import java.util.Stack;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.ActivityManager;
import android.app.ActivityManager.RunningTaskInfo;
import android.content.Context;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.util.Log;

/**
 * 应用程序Activity管理类：用于Activity管理和应用程序退出
 * 
 * @author liux (http://my.oschina.net/liux)
 * @version 1.0
 * @created 2012-3-21
 */
public class AppManager {

    private static Stack<Activity> activityStack;
    private static AppManager instance;

    private AppManager() {
    }

    /**
     * 单一实例
     */
    public static AppManager getAppManager() {
        if (instance == null) {
            instance = new AppManager();
        }
        return instance;
    }

    /**
     * 添加Activity到堆栈
     */
    public void addActivity(Activity activity) {
        if (activityStack == null) {
            activityStack = new Stack<Activity>();
        }
        activityStack.add(activity);
    }

    /**
     * 获取当前Activity（堆栈中最后一个压入的）
     */
    public Activity currentActivity() {
        Activity activity = activityStack.lastElement();
        return activity;
    }

    /**
     * 结束当前Activity（堆栈中最后一个压入的）
     */
    public void finishActivity() {
        Activity activity = activityStack.lastElement();
        finishActivity(activity);
    }

    /**
     * 结束指定的Activity
     */
    public void finishActivity(Activity activity) {
        if (activity != null) {
            activityStack.remove(activity);
            activity.finish();
            activity = null;
        }
    }

    /**
     * 结束指定类名的Activity
     */
    public void finishActivity(Class<?> cls) {
        for (Activity activity : activityStack) {
            if (activity.getClass().equals(cls)) {
                finishActivity(activity);
            }
        }
    }

    /**
     * 结束所有Activity
     */
    public void finishAllActivity() {
        for (int i = 0, size = activityStack.size(); i < size; i++) {
            if (null != activityStack.get(i)) {
                activityStack.get(i).finish();
            }
        }
        activityStack.clear();
    }

    /**
     * 退出应用程序
     */
    public void AppExit(Context context) {
        try {
            finishAllActivity();
            ActivityManager activityMgr = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
            activityMgr.restartPackage(context.getPackageName());
        } catch (Exception e) {
        }
    }

    /**
     * 判断Activity是否关闭
     * 
     * @param context
     * @return
     */
    @SuppressLint("NewApi")
    public static boolean isActivityDestroyed(Context context) {
        if (null == context)
            return true;
        if (!Activity.class.isInstance(context))
            return false;
        Activity activity = (Activity) context;
        if (activity.isFinishing()) {
            return true;
        }
        if (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN_MR1) {
            return activity.isDestroyed();
        }
        return false;
    }

    /**
     * 取得栈顶的Activity
     * 
     * @param context
     * @return
     */
    public static boolean isTopActivity(Context context) {
        String packageName = "cn.com.youlove.weijing";
        ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        List<RunningTaskInfo> tasksInfo = activityManager.getRunningTasks(1);

        if (tasksInfo.size() > 0) {
            Log.i("TAG", tasksInfo.get(0).topActivity.getPackageName());
            if (packageName.equals(tasksInfo.get(0).topActivity.getPackageName())) {
                return true;
            }
        }
        return false;

    }
}
